HALT · UNEXPLAINED MOVE · FRI SEP 11 2026

GOSS halted on Sep 11 2026 at $0.1476

GOSS0.0%on Fri Sep 11 2026

Gossamer Bio, Inc. Common Stock was up 0.0% on the day at $0.1476, ranked #13 on — its usual five-minute volume, when TapeRank recorded this trading halt at 04:00 ET during the pre-market session when it was halted. TapeRank recorded 2 events for GOSS that day, between 04:00 and 09:31 ET, and each is in the timeline below.

THE DAY ON THE LIST · 2 EVENTS

  1. 04:00 ET
    HALT · PRE-MARKET

    HALTED AT $0.1476 · · 0.0% ON THE DAY · — 5M RVOL · RANK #13

    UNEXPLAINEDNO FILINGS · RULE

    GOSS is flat on the day on no measurable its normal volume for this time of day, and trading is halted under code T1. No filings or headlines were found in SEC EDGAR filings in the last 24 hours, so this is order flow rather than a disclosed catalyst.

    WHYNo filings or headlines within 24 hours of the move.
    ANALYZED 04:00 ET · <1 MIN AGO · RULE, NO MODEL
    THE ROW AND SESSION LEVELS AT 04:00 ET
    LAST0.1476
    DAY· 0.0%
    5 MIN· 0.00%
    5M RVOL—
    5M $VOL—
    FLOAT—
    RANK#13
    SESSIONPRE-MARKET
    VWAP0.1436
    HOD0.1476
    LOD0.1438
    OR HIGH—
    OR LOW—
    PREV CLOSE—
    PM HIGH—
    PM LOW—
    GAP—

    — MEANS THE LEVEL DID NOT EXIST YET AT THAT INSTANT, NOT ZERO

  2. 09:31 ET
    UNEXPLAINED MOVE · REGULAR

    $12.26 · ▲ 8206.2% ON THE DAY · — 5M RVOL · RANK #59

    UNEXPLAINEDCONFIDENCE4/5

    The reported +7440% move is a mechanical artifact of a 1-for-80 reverse stock split that took effect this week, not a genuine price move reflecting new information. The 5-minute reversal of nearly 11% alongside thin, choppy volume suggests price discovery and order-flow noise following the split adjustment rather than any fresh catalyst.

    WHYA reverse split mechanically re-bases the share price by 80x, which fully explains the reported percentage gain, while the underlying business news is nonexistent, so the true catalyst-driven move is effectively zero.
    ANALYZED 09:34 ET · <1 MIN AGO · ANTHROPIC/CLAUDE-SONNET-5
    THE ROW AND SESSION LEVELS AT 09:31 ET
    LAST12.26
    DAY▲ 8206.2%
    5 MIN▲ 1.24%
    5M RVOL—
    5M $VOL$217K
    FLOAT—
    RANK#59
    SESSIONREGULAR
    VWAP12.30
    HOD13.25
    LOD8.03
    OR HIGH12.52
    OR LOW12.00
    PREV CLOSE0.1476
    PM HIGH13.25
    PM LOW8.03
    GAP▲ 8355.28%

THE SESSION

  • 09:30 ETOpened at $12.48, +8355.3% on the previous close of $0.1476
  • 09:30 ETRegular-session high, $12.52
  • 13:17 ETRegular-session low, $10.47
  • 15:59 ETLast trade of the regular session, $10.70, +7145.9% on the previous close of $0.1476
  • Volume: 450K shares in regular hours, 5K before the open

GOSS opened at $12.48 and briefly reached $12.52 after TapeRank had recorded it at $0.1476 before the open, with the reported gain driven by a 1-for-80 reverse stock split that re-based the share price. TapeRank recorded an unexplained move at $12.26 at 09:31 ET and found no filings or headlines within 24 hours to explain it; the stock then fell to a $10.47 low at 13:17 ET before finishing at $10.70. There were no trading halts during the regular session, and TapeRank’s read was that the move was unexplained rather than tied to fresh business news.

WRITTEN THU OCT 15 2026 17:47 ET BY OPENAI/GPT-5.6-LUNA FROM THE FACTS ON THIS PAGE

FILINGS · 24H BEFORE THE MOVE

No SEC filings in the 24 hours before this was recorded. A move on an unfiled press release shows nothing here, which is what UNEXPLAINED means.

On the tape right now

WHERE THE LIST STOODWED NOV 4 2026 · 13:49 ETRECORDED LIVE · 742 QUALIFY

01
ECGSURGING 0:05
79.71
▼ 29.3%
▼ 1.41%
41.0×
FAD
$6.2M
51.1M*
STRETCHED
02
CAVASURGING 0:00
64.78
▲ 7.4%
▲ 1.30%
9.3×
ORBHODVWH
$11.6M
116.8M*
UNEXPLAINED
03
URGNSURGING 0:00
29.16
▼ 15.2%
▼ 1.29%
15.6×
FAD
$1.4M
48.9M*
JUSTIFIED
04
MPTISURGING 0:00
64.15
▼ 1.5%
▲ 0.96%
23.8×
VWH
$637K
4.3M*
UNEXPLAINED
05
LSPDSURGING 0:00
11.52
▲ 4.9%
▼ 1.24%
16.5×
ORB
$426K
133.3M*
UNEXPLAINED
06
CRCTSURGING 0:00
8.90
▲ 49.2%
▼ 0.72%
15.1×
GAPORBVWHEXT
$395K
54.7M*
STRETCHED
07
BROSSURGING 0:00
43.97
▲ 0.9%
▼ 0.91%
4.0×
FAD
$4.3M
137.9M*
UNEXPLAINED
08
LMRICOOLING 1:35
12.85
▲ 14.5%
▲ 1.06%
132×
ORBHODVWH
$1.7M
—
UNEXPLAINED
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